package o1.adventure

import scala.collection.mutable._

/**
 * The class `Area` represents locations in a text adventure game world.
 * A game world consists of areas. In general, an "area" can be pretty much
 * anything: a room, a building, an acre of forest, or something completely
 * different. What different areas have in common is that players can be located
 * in them and that they can have exits leading to other, neighboring areas.
 * An area also has a name and a description.
 *
 * @param name         the name of the area
 * @param description  a basic description of the area (typically not including
 *                     information about items)
 */
class Area(var name: String, var description: String) {

  private val neighbors = Map[String, Area]()
  private var items = ArrayBuffer[Item]()


  /**
   * Returns the area that can be reached from this area by moving in the
   * given direction.
   *
   * @return the neighboring area, wrapped in an `Option`; `None` if there
   *         is no exit in the given direction
   */
  def neighbor(direction: String) = this.neighbors.get(direction)


  /**
   * Adds an exit from this area to the given area. The neighboring area
   * is reached by moving in the specified direction from this area.
   *
   * @param direction  the direction of the exit from this area
   * @param neighbor   the area that the exit leads to
   */
  def setNeighbor(direction: String, neighbor: Area) = {
    this.neighbors += direction -> neighbor
  }


  /**
   * Adds exits from this area to the given areas.
   * Calling this method is equivalent to calling the `setNeighbor`
   * method on each of the given direction--area pairs.
   *
   * @param exits  pairs of directions and the neighboring areas in that direction
   * @see [[setNeighbor]]
   */
  def setNeighbors(exits: Vector[(String, Area)]) = {
    this.neighbors ++= exits
  }


  /**
   * Returns a multi-line description of the area as a player sees it.
   * This includes a basic description of the area as well as information
   * about exits and items.
   */
  def fullDescription = {
    val exitList = "\n\nExits available: " + this.neighbors.keys.mkString(" ")
    this.description + exitList + "\n" +
    "You see here: " + this.items.mkString
  }


  def addItem(item: Item): Unit = {
    this.items += item
  }

  def contains(itemName: String): Boolean = items.contains(itemName)

  def removeItem(itemName: String): Option[Item] = {
    if (items.contains(itemName)) {
      val toBeRemoved = items.filter( _.name == itemName)
      items = items diff toBeRemoved
      Some(toBeRemoved(0))
    } else None
  }




  /**
   * Returns a single-line description of the area for debugging purposes.
   */
  override def toString = this.name + ": " + this.description.replaceAll("\n", " ").take(150)



}